Possible Causes

A left side air bag circuit short to battery or ignition voltage could be caused by short to battery or ignition voltage in White/Light Blue wire (circuit No. 1257), short to battery or ignition voltage in Brown/Light Blue wire (circuit No. 1258), short to battery or ignition voltage in left side air bag module or RCM internal fault.

1. Check for hard or intermittent DTC
   
   Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). See USING SCAN TOOL  under DIAGNOSTICS. Turn ignition switch to RUN position. Retrieve and record any continuous DTCs. See RETRIEVING FAULT CODES  under DIAGNOSTICS. Perform on-demand self-test. See ON-DEMAND SELF-TEST  under DIAGNOSTICS. If DTC B1992 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B1992 was not retrieved, fault is intermittent. Go to step  7 .
2. Check left side air bag module
   
   Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Turn ignition switch to RUN position. Perform on-demand self-test. If DTC B1992 is retrieved, go to step  5 . If DTC B1992 is not retrieved, go to next step.
3. Check left side air bag circuit for short to voltage
   
   Turn ignition switch to OFF position. Disconnect left side air bag simulator from harness connector. Turn ignition switch to RUN position. Measure voltage in White/Light Blue wire between ground and harness side of left side air bag module floor harness connector. See WIRING DIAGRAMS  . If voltage is more than 10 volts, repair short to voltage in White/Light Blue wire. Go to step  8 . If voltage is less than 10 volts, go to next step.
4. Check left side air bag circuit for short to voltage
   
   Measure voltage in Brown/Light Blue wire between ground and harness side of left side air bag module floor harness connector. If voltage is more than 10 volts, repair short to voltage in Brown/Light Blue wire. Go to step  8 . If voltage is less than 10 volts, replace left side air bag module. See SIDE AIR BAG MODULE  under REMOVAL & INSTALLATION. Go to step  8 .
   NOTE: Do not separate or remove shorting bars from connector C2004.
5. Check left side air bag circuit to seat harness
   
   Turn ignition switch to OFF position. Disconnect negative battery cable. Access RCM and disconnect harness connectors C2004 and C2005. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Turn ignition switch to RUN position. Measure resistance between harness side of RCM connector C2004, terminal No. 2 (White/Light Blue wire) and harness side of RCM connector C2005, terminal No. 2 (Violet/Orange wire, circuit No. 298). If resistance is less than 10 k/ohms, repair short to voltage in White/Light Blue wire. See WIRING DIAGRAMS  . Go to step  8 . If resistance is more than 10 k/ohms, go to next step.
6. Check left side air bag circuit to seat harness
   
   Disconnect left side air bag module simulator. Inspect all crimps, terminals, wires and connectors in circuit No. 1257 (White/Light Blue wire) between left side air bag module floor harness connector and RCM connector C2004, terminal No. 2. Inspect all crimps, terminals, wires and connectors in circuit No. 1258 (Brown/Light Blue wire) between left side air bag module floor harness connector and RCM connector C2004, terminal No. 3. Also, check for pinched wires and damaged connector terminals. If any damage is found, repair or replace as necessary. Go to step  8 . If no damage is found, replace RCM. Go to step  8 .
7. Check for intermittent fault
   
   Refer to continuous DTCs recorded in step  1 . If DTC retrieved in step  1 was a intermittent fault, check for cause of intermittent short to voltage in White/Light Blue wire and Brown/Light Blue wire. See WIRING DIAGRAMS  . Attempt to recreate fault by flexing wire harness and cycling ignition switch frequently. Repair any intermittent problems found. Go to next step. If DTC retrieved in step  1 was not a intermittent fault, go to next step.
8. Check for additional DTCs
   
   Refer to continuous DTCs recorded in step  1 . If any continuous DTCs were retrieved, go to diagnostic trouble code identification table for direction to appropriate test. DO NOT clear any DTCs until all DTCs have been resolved. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table. If no DTCs were retrieved, reconnect air bag system. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Clear all DTCs. See CLEARING FAULT CODES  under DIAGNOSTICS.